Design and protocol of the weight loss lottery- a cluster randomized trial

Koen van der Swaluw*, Mattijs S Lambooij, Jolanda J.P. Mathijssen, Maarten Schipper, Marcel Zeelenberg, Johan J. Polder, Henriëtte M. Prast

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review


People often intend to exercise but find it difficult to attend their gyms on a regular basis. At times, people seek and accept deadlines with consequences to realize their own goals (i.e. commitment devices). The aim of our cluster randomized controlled trial is to test whether a lottery-based commitment device can promote regular gym attendance. The winners of the lottery always get feedback on the outcome but can only claim their prize if they attended their gyms on a regular basis. In this paper we present the design and baseline characteristics of a three-arm trial which is performed with 163 overweight participants in six in-company fitness centers in the Netherlands.

Original languageEnglish
Pages (from-to)109-115
Number of pages7
JournalContemporary Clinical Trials
Publication statusPublished - 1 Jul 2016


  • Cluster randomized trial
  • Commitment device
  • Lottery deadline
  • Physical activity


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